- Added automatic HEAD routes for GET, plugin hinting, and preSerialization hook support for custom reply serializers.
- Updated ecosystem docs with new plugins (awilix, openapi, print routes, traps, disablecache, autoload) and fixed typos and HTTP links to HTTPS.
- Fixed error handling for already‑sent async replies and prevented onRoute calls during prefixing; upgraded dev dependencies (undici, frameguard, sinon timers).
v3.10.0
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Fix for two Fastify security advisories (GHSA‑w2qp‑rph6‑63g4 and GHSA‑3m5p‑2c4r‑xxw2).
Added per‑route logging for Google Cloud Functions and introduced `Reply.prototype.mediaType` for easier content‑type handling.
Fixed trailer state clearing when removing all trailers and corrected requestCompleted handling to use null instead of undefined.